Shelly,
We manufacture an item, not leather, in our family business. We sell strictly wholesale and have for 35 years.
I take every movement made to make the product, time it.
Every item of leather plus a percentage for waste, electricity for lighting, insurance, absolutely everything.
Total those costs and realistically figure the number of items you can make in say, 8 hours. Being a family business we figure $25.00 per hour. Now you know how much it costs for each pair of straps.
Take one half of the total costs, add it to the cost, add 10 percent of that total for profit.
That is the way we do it. There are definitely other methods. This has worked for us for 35 years. We are living our fruits of the labor in our beautiful Log Home for the last 16 years and I hope a lot more.
ferg